Rock-drilling mechanism



C. F. OSGOOD ROCK DRILLING MEcHANIsu Filed June 30. 1922 Nov. 22, 1927. 1,650,383

Patented Nov. 22, 1927.

UNITED STATES 1,550,383 PATENT oFFlCE.

CHARLES F. OSGOOD, OF CLARIISJIVIONT,l HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CORPORATION OIE" IVIASSACHUSET'TS;A

ROCK-DRILLING MECIIANISM.

Application filed June 30,

My invention relates to rock drilling mechy anisms, Vand more particularly to improved improved rock C. I u rock drilling mechamsm.

kfeedino` mechanisms for employment with An object of my invention is to providethe hole due to the elasticity of the feed,

may be avoided and in which any sudden jumping of the drill, should the-steel suddenly run `out into very soft ground or-a cavity or pocket, may bechecled. Other objects and advantages of r y invention will hereinafter more fully appear'.

In the accompanying drawings,I have shown for purposes of illustrationV twoforms which my invention may assume in practice.

In these drawings,- f

Fig. 1 is a central longitudinal section with parts shown in elevation through one illustrative embodiment of my improved feed controlling mechanism. Y

Fig. 2 is a transverse section on thel line 2-2 of Fig. 1,- f

Fig. 3 is a detail view on a section similar to that of Fig. 1, showing a` modified form.

In the illustrative form of my invention shown in Figures 1 and 2, the same is shown employed in a stoping drilling mechanism which is generally indicated by 1 and which comprises a drilling motor 2 and feeding mechanism 3. The feeding mechanism comprises an intermediate head member 4 anda feed cylinder 5. Vithin the feed cylinder 5 is disposed a feed piston 6 having a feed piston rod-B7 terminating in a point 8 adapted to rest against an abutment during feeding. The rod 'Z is provided with longitudinal splineways 9 which are engaged by keys 9 formed in the lowervhead 10 of the feed cylinder 5 and prevents rotation of the feed piston during feeding. The feed piston and piston rod are made hollow andV arifle bar 11 supported, as hereinafter described, in the intermediate vhead 4, extends through the piston and into the rod, a guid 12 being provided for the lower end of the rifle bar to maintain it centered, and the upper end 1922.- .sriai No. 572,053.

of the rifle barengaging internal threads 13 y in the piston 6. The upperend of the bar is provided with a head 14 andV laterally frictionally resisty turning of one platerelative, to the other; Suitable means (not shown) as a segment rack may be provided to hold the handle in any desired position. A pair of mating grooves 25 are formed in the adjacent sides of the members 16 and 19 and a wave spring 26 tends to maintain them in separated condition, except when forced into engagement, in a manner which willA shortly be described. Air is supplied by way of a passage v27 under control of a valve 28 to effect forward feed. v

The mode of operation of this form of my invention is as follows: l

Air will be admitted through the passage 27 and the drill runner will manipulate the handle-23 in al manner to cause the load applying member 2O to. cause frictional engagement between theplates 19`and 16, and, depending upon the degree of engagement, the resistance to rotation of the rifle bar 11 willbe increased lor decreased and so the rate and force o f the feed controlled. The

rifle b ar 11 must rotate in order for vthe cylinder 5 to move relative to the piston 6 on account of the spline connection 9, 9 between the cylinder and piston rod. Accordingly, the rate of feed may be controlled by increasing or decreasing the friction between the plates 16 and 19. In the event that the drill is drilling, full pressure willA be supplied to the space in the cylinder between its upper head and the top of the piston and normally the friction applying member 2O will be applied without great pressure in order that the rifle bar willsimply be held against rotation sufficiently to prevent bouncing. Accordingly, if the drill steel suddenly breaks through into a pocket, there would be a'strong ltendency for the feed to shoot the par-ts sharply forward. Howi the friction discs by the head 14.

ever, by reason of my improved construction, no such jumping is to be anticipated, for, as the sudden forward movement starts, the reaction of the nut upon the feed screw 11 as the latter tends to be drawn rapidly through the nut will cause the head 14 to apply a considerable pressure to the member 19 and so will automatically effect the breaking of the feed long enough to enable the drill runner to manipulate the handle 23 to hold back the feed.

In the form of my invention shown in Figure 8, instead of employing a pair of friction discs 19 and 16, .I employ a series of discs 3l and 32, respectively non-rotatably connected to the intermediate head l and to the rifle bar by means of a lugged collar 33. rIlhese plates 31 and 32 are not normally held from engagement with each other by any spring means, but a spring 3d arranged between a collar 35 below and spaced from the bottom plate 31 and engaging the lugged collar 33 serves to maintain the head 1st of the rifle bar, corresponding to the head 14- in the first form of my invention, normally out of engagement with the top plate 31. rlhe tension of this spring may obviously be adjusted by the follower 36. j

In this form of my invention it will be observed that during normal operation, the spring-34; will prevent the head 14 from applying any pressure to the plates so that feed at the usual desired rate can be accomplished without any load being imparted to In the event of jumping occurring, however, the reaction of the nut upon the rifle bar will be strong enough to overcome the pressure of the spring and the head 14- will then apply additional force to the friction plates in a manner .sufficient to check the rapidity of movement of the feed cylinder and drill.

lWhile I have in this application specifically described two forms which my invention may assume in practice, it will be understood that these forms of the same are shown for purposes of illustration and that the invention may be modified and embodied in other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a drilling mechanisln, the combination including' a drilling motor, a drill steel actuated thereby, feeding means for said motor. friction resistance means operatively connected to said feeding means andresponsive to variations in the resistance encountered by the drill steel for automatically controlling said feeding means, and manually operable means associated with said automatic means for controlling said feeding means.

2. In a drilling` mechanism, the combination including a drilling motor, a drill steel actuated thereby feeding means for said motor, and means responsive to variations in the resistance encountered by the drill steel and operatively connected to said feeding means for automatically frictionally controlling actuated thereby, feeding means for said motor, and means responsive to variations in the resistance encountered'by the drill steel and operatively connected to said feeding means for automatically frictionally controlling said feeding means, said controlling means comprising a friction brake and a separate normally rotatable elementk cooperating therewith and havingylimited axial movement.

d. In a drilling mechanism, the combination including a drilling motor, a drill steel actuated thereby, feeding means for said motor including relatively movable members, one of said members being connected to said drilling motor, a rotatable brake rod movable with one of said members and engaging the other member, a brake comprising relatively rotatable frictionplates for checkin@y and preventing rotation of said brake rod and means for automatically actuating said brake in accordance with the variations in the resistance encountered by the drill steel.

5. In a drilling mechanism, the combination including a drilling motor, feeding means therefor comprising relatively movable elements having a normal rate of movement, frictional resistance means operatively connected to said feedinO' elements and eective only when said normal rate of movement is exceeded during feeding for automatically checking said movement, and manually operable means associated with said automatic means for restraining the relative movement between said elements.

6. In a drilling mechanism, the combination including a drilling motor, pressure fluid actuated feeding means therefor including cylinder and piston elements having a normal of relative movement under pressure fluid, and means operatively connected to said feeding elements and effective only when said normal rate of movement is exceeded during feeding for automatically retarding said movement, said means comprising a rifle bar and a cooperating nut.

fr". In a drilling mechanism, the combination including a drilling motor. pressure tl uid actuated feeding means therefor including cylinder and-piston elements having a normal rate of relative movement under pressure fluid, and means operatively connected to said feeding elements and effective only when Said normal rate Qt relative movelill ment is exceeded during feeding for automatically retarding said movement, said means including a friction plate brake.

8. In a drilling mechanism, the combination including a drilling motor, pressure fluid actuated feeding means therefor including cylinder and piston elements having a normal rate of relative movement under pressure fluid, and means operatively connected to said feeding elements and effective only When said normal rate of relative movement is exceeded during feeding for automatically ret-arding said movement, said means including a friction brake, and manually'operable means for loading said brake.

9. In a drilling mechanism, the combination including a drilling motor, feeding means therefor including elements having a normal rate of relative movement during feeding, means operatively connected to said feeding elements and including al rifle bar and nut and controlling means for the rotation of one of the same for regulating the normal rate of feed, and means associated With said rifle bar and nut effective only when said normal rate of feed is exceeded for automatically preventing an excessive rate of feed. l

l0. In a drilling mechanism, the combination including a drilling motor, pressure fluid actuated feeding mechanism therefor including relatively movable cylinder and piston elements, means for supplying pressure fluid thereto, and means operatively connected to said feeding elements for controlling the rate of feed effected by the pressure so supplied including a nut on said piston, a rifle bar carried by said cylinder, friction means controlled by the rate of rotation of said rifle bar, and means carried by said rifle bar for applying said friction means.

ll. In a .drilling mechanism, the combination including a drilling motor, pressure Huid actuated feeding means therefor including cylinder and piston elements having a normal rate of relative movement under pressure fluid, and means operatively connected to said feeding elements and effective only when said normal rate of relative movement is exceeded to automatically prevent excessive rates of relative movement therebetween, said latter means including cooperating relatively rotatable brake elements and a member connected to one of said brake elements and coaxially disposed with said feeding cylinder, said member being axially movable relative to said latter brake element.

l2. In a drilling mechanism, the combination including a drilling motor, feeding means therefor comprising elements having a normal rate of relative movement during feeding, and means operatively connected to saidfeeding elements and effective only when said normal rate of relative movement is exceeded for automatically frictionally restraining said movement, and manually operable means associated with said automatic means for manually varying the'normal rate of relative movement between said elements. Y

13. In a drilling mechanism, the combination including a ydrilling motor, a drill steel actuated thereby, pressure fluid actuated feeding means for said motor, means for supplying pressure fluid thereto including a manually operable controlling valve, manually operable means for regulating the rate of feed, and means responsive to variations in the resistance encountered by the steel for automatically controlling said feeding means.

le. In a pneumatic feeding mechanism, a

feed cylinder, a feed piston, means for supplying fluid pressure thereto, and means for controlling the rate of feed effected by the pressure so supplied including a nut on said piston, a rifle bar carried by said cylinder, friction means controlling the rate of rotation of said rifle bar, means carried by said rifle bar for applying said friction means, and manually operated means-for loading said friction means.

l5. In a pneumatic feedingpmechanism, a f

feed cylinder, a feed piston, means for supplying fluid pressure thereto, and means for controlling the rate of feed effected by the pressure so supplied including a nut on said piston, a rifle barcarried by said cylinder, friction means controlling the rate of rotation of said rifle bar, means carried by said rifle bar for applying said friction means, and manually operated means for loading said friction means',`said second mentioned means'being operative only on excessively rapid relative movement between said cylinder and piston.

16. In a pneumatic feeding mechanism, a feed cylinder, a feed piston, means for supplying fluid pressure thereto, and means for controlling the rate of feed effected by the pressure so supplied including a nut on said piston, a rifle. bar carried by .said cylinder, friction means controlling the rate of rotation of said rifle bar, means carried by said rifle bar for applying said friction means, manually operated means for loading said friction means, and means for preventing operation of said second mentioned means except on excessively rapid move-ment of said cylinder relative to said piston.

In testimony whereof I affix my signature.

CHARLES F. OSGQOD.

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